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Tap water quality report

Marchi Central Farm

EPA monitoring tested this supplier for 81 contaminants and detected 15. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

81
contaminants tested
15
detected
50
people served
4
health-based violations
California rankingsLead in CaliforniaPFAS in California
Water source
Ground water
Ownership
Private
Counties served
San Mateo

Compliance record

Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.

4
health-based violations
23
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2024-01-01 → 2024-03-31
MCL Health-based Resolved 2024-01-01 → 2024-03-31
MCL Health-based Resolved 2008-09-01 → 2008-09-30
MCL Health-based Resolved 2008-09-01 → 2008-09-30
MR Monitoring Resolved 2023-11-15
MR Monitoring Resolved 2023-11-15
MR Monitoring Resolved 2023-04-01 → 2023-06-30
MR Monitoring Resolved 2023-04-01 → 2023-06-30
Other Monitoring Resolved 2021-01-01 → 2021-03-31
Other Monitoring Resolved 2021-01-01 → 2021-03-31

Other contaminants detected

Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the 95th percentile of this system's samples — over 100% is worth reading, but is not by itself a violation. Where a single sample came in higher than that percentile, it is noted under the bar. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Nitrate
29380 µg/L 294%
of the EPA limit, at the 95th percentile of samples — 10000 µg/L
worst single sample: 31640 µg/L
48/48 SYR4 2012–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 9/9 LCR 2024
Chloroform
18.24 µg/L
No EPA limit set
worst single sample: 21 µg/L
4/4 SYR4 2016–2019
TTHM
18.945 µg/L 24%
of the EPA limit 80 µg/L
worst single sample: 21 µg/L
4/4 SYR4 2016–2019
Bromodichloromethane
2.05 µg/L
No EPA limit set
worst single sample: 2.1 µg/L
3/4 SYR4 2016–2019
Dibromochloromethane
1.4 µg/L
No EPA limit set
 3/4 SYR4 2016–2019
Dichloroacetic Acid
10.22 µg/L
No EPA limit set
worst single sample: 11 µg/L
3/4 SYR4 2016–2019
Fluoride
189 µg/L 4.7%
of the EPA limit 4000 µg/L
worst single sample: 190 µg/L
3/3 SYR4 2013–2019
Total Haloacetic Acids (HAA5)
15.8 µg/L 26%
of the EPA limit 60 µg/L
worst single sample: 17.2 µg/L
3/4 SYR4 2016–2019
Arsenic
7.955 µg/L 80%
of the EPA limit 10 µg/L
worst single sample: 8.1 µg/L
2/3 SYR4 2013–2019
Nitrate-Nitrite
3890 µg/L 39%
of the EPA limit 10000 µg/L
worst single sample: 4000 µg/L
2/2 SYR4 2016–2019
Antimony, Total
15 µg/L 250%
of the EPA limit, at the 95th percentile of samples — 6 µg/L
 1/6 SYR4 2013–2017
Bromoform
1.6 µg/L
No EPA limit set
 1/4 SYR4 2016–2019
Gross Beta Particle Activity
1.15 pCi/L
No EPA limit set
 1/1 SYR4 2012
Trichloroacetic Acid
6.2 µg/L
No EPA limit set
 1/4 SYR4 2016–2019
66 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane2,3,7,8-TCDD2,4,5-TP2,4-DAsbestosAtrazineBhc-GammaBariumBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCopperCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromoacetic AcidDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoLeadMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
MARCHI, PETER
Phone
650-726-4301
Email
[email protected]

Frequently asked questions about Marchi Central Farm

Is Marchi Central Farm tap water safe to drink?

EPA monitoring detected 15 contaminants in Marchi Central Farm's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.

What contaminants were detected in Marchi Central Farm's water?

EPA monitoring detected Nitrate, Lead, Chloroform, TTHM, Bromodichloromethane, and others. The full list with the level and data source for each is above.

How many people does Marchi Central Farm serve?

Marchi Central Farm reports serving 50 people in California, per its EPA record.

Has Marchi Central Farm had any water quality violations?

The EPA has 23 violations on file for Marchi Central Farm, of which 4 are health-based (a contaminant limit or required treatment was breached) and 0 remain open. The rest are monitoring or reporting failures.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.